*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
header{
    background-color: rgb(217, 233, 248);
    padding: 3em;
    color: rgb(45, 66, 200);
    text-align: center;
}
section>nav{
    float: left;
    width:30%;
    background-color: blanchedalmond;
    padding: 1.5em;
    height: 250px;
}
section>nav>ul{
    list-style: none;

}
section>nav>ul>li>a{
    text-decoration: none;
    color: rgb(171, 119, 6);
}
article{
    padding:20px;
    width: 70%;
    /* background-color: cadetblue; */
    float: left;
}
footer{
    background-color: rgb(166, 161, 195);
    padding: 20px;
    text-align: center;
}

.clearfix::after{
    content: '';
    display: block;
    clear: both;
    overflow: hidden;
}

/* 반응형웹 */
@media screen and (max-width:600px) {
    section>nav,article{
        width: 100%;
        height: auto; }
}